Syiiopsis of the Genus Achatinella. 309 



Mr. Reeve gives a shell from a different group for the true 

 jpulcherrima Swain., and follows Dr. Pfeiffer in giving A. By- 

 ronii Gray as a synonym. As it happens, the A. Byronii pre- 

 served in the British Museum is distinct from both the shells re- 

 ferred to, but proves to be identical with A. melanostoma Newc. 



My friend Mr. Gulick is peculiarly unfortunate in tracing 

 out his synonyms in Ann. Lye. vi. p. 244. The original of 

 Swaiuson's shell is in the magnificent collection of Mr. Cuming. 



11. A. perversa Swains. Zool. 111. pi. 99, fig. 2. 



" concidens Gul. Ann. Lye. 1. c. fig. 54. An immature dead shell. 

 " cinnamomea Pfr. var. Zool. Proc. 1858, p. 22. 



Animal long as the shell ; light grey color, tentacles and 

 sheath light brown with a bar of brown across the front, upper 

 tentacles alone clavate, strongly swelling at their base ; granu- 

 lations large. 



There are several varieties of this species, one of which has 

 so near an approach to A. decora, as to lead to their being con- 

 founded with each other. They are, however, widely separated 

 in locality, and the animals are even more distinct in markings 

 and habit than the shells themselves. 



12. A. rosea Swains. Zool. 111. pi. 123, fig. l. 



Animal, when young, of a bright straw yellow, with ocular 

 appendages tinged with brown. 



In the adult, the color is a uniform light grey, with mantle 

 and tentacles dark brown. 



13. A. livid a Swains. Zool. 111. pi. 108, fig. 2. 



" viridans Reeve non Mighels. Mon. No. 25. 



" Reevei C. B. Adams. Contributions, p. 128. 



" Emersonii Newc. Zool. Proc. fig. 74. 1853. 



" glauca Gul. Ann. Lye. 1. c. fig. 51. 



